Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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METHODS AND SYSTEMS FOR REMOTELY MONITORING AND CONTROLLING
HVAC UNITS
TECHNICAL FIELD
[0001] The present disclosure is directed, in general, to energy usage control
and, more
particularly, to methods and systems for remotely monitoring and controlling
heating,
ventilation, and air-conditioning (HVAC) units.
BACKGROUND OF THE DISCLOSURE
[0002] Improved HVAC monitoring and control systems are desirable.
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SUMMARY OF THE DISCLOSURE
[0003] Various disclosed embodiments include methods, systems and mediums for
monitoring and controlling HVAC units. The method includes receiving by a
processor
via a communication network supply temperature data indicating a supply air
temperature
in a duct coupled to an HVAC unit, the processor being located at a
geographically
remote location from the HVAC unit. The method includes receiving by the
processor via
the communication network zone temperature data of a space being maintained by
the
HVAC unit. The method includes receiving by the processor via the
communication
network thermostat data from a thermostat in the space. The thermostat data
may include
information such as, for example, whether or not the HVAC unit is attempting
to heat,
cool, or just run the fan; if the HVAC unit is in stage 1 or 2 of heating or
cooling; and/or
if the zone temperature is being monitored by the thermostat or is being
monitored
remotely. According to some disclosed embodiments, the method includes
receiving by
the processor other additional data such as, for example, data from humidity
sensors,
data from CO2 sensors, data from enthalpy sensors, or data from outside
temperature
sensors via the communication network. The method includes analyzing by the
processor
at least one of the supply temperature data, the zone temperature data,
thermostat data,
and other additional data to determine if the HVAC unit is malfunctioning. The
method
includes generating by the processor a control signal responsive to the
analysis and
transmitting via the communication network the control signal to an HVAC
controller,
wherein the control signal causes the HVAC controller to control the HVAC
unit.
[0004] According to some disclosed embodiments, the method includes receiving
by
the HVAC controller zone temperature data, supply temperature data, thermostat
data,
outside temperature data, and other additional data. The method includes
analyzing by the
HVAC controller at least one of the zone temperature data, supply temperature
data,
thermostat data, outside temperature data, and other additional data. The
method includes
controlling by the HVAC controller one or more HVAC units in response to
analysis of
the data. The method includes transmitting by the HVAC controller a control
signal to
one or more thermostats which causes the HVAC units to be disabled or turned
OFF.
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[0004a] According to one aspect of the present invention, there is
provided a method
for remotely monitoring and controlling a heating, ventilation and air-
conditioning (HVAC)
unit, the method comprising: receiving by a processor via a communication
network supply
temperature data indicating a supply air temperature in a duct coupled to the
HVAC unit, the
processor being at a geographically remote location from the HVAC unit;
receiving by the
processor via the communication network zone temperature data of a space being
maintained
by the HVAC unit; receiving by the processor via the communication network
thermostat data
from a thermostat in the space; analyzing by the processor at least one of the
supply
temperature data, the zone temperature data and the thermostat data to
determine if the HVAC
unit is malfunctioning; generating by the processor a control signal
responsive to the analysis;
and transmitting via the communication network the control signal to an HVAC
controller,
wherein the control signal causes the HVAC controller to transmit a disable
signal to a
thermostat causing the HVAC unit to be disabled by the thermostat.
[0004b] According to another aspect of the present invention, there is
provided a
method for remotely monitoring and controlling a plurality of heating,
ventilation and air-
conditioning (HVAC) units, the method comprising: receiving by a processor via
a
communication network respective supply air temperature data of the plurality
of HVAC
units, the processor located at a geographically remote location from the HVAC
units;
receiving by the processor via the communication network zone temperature data
of the
plurality of HVAC units; receiving by the processor via the communication
network
thermostat data of the plurality of HVAC units; analyzing by the processor at
least one of the
supply temperature data, the zone temperature data and thermostat data of the
plurality of
HVAC units to determine whether one or more of the plurality of HVAC units are
malfunctioning; generating by the processor one or more control signals
responsive to the
analysis; and transmitting via the communication network the control signals
to an HVAC
controller, wherein the one or more control signal causes the HVAC controller
to transmit a
disable signal to a thermostat causing the one or more malfunctioning HVAC
units to be
disabled by the thermostat.
[0004c] According to still another aspect of the present invention, there
is provided a
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data processing system configured to monitor and control a heating,
ventilation and air-
conditioning (HVAC) unit, the data processing system being located at a
geographically
remote location from the HVAC unit, the data processing system comprising: a
storage device
comprising an HVAC application; an accessible memory comprising instructions
of the
HVAC application; and a processor configured to execute the instructions of
the HVAC
application to: receive via a communication network supply temperature data
indicating a
supply air temperature in a duct coupled to the HVAC unit; receive via the
communication
network zone temperature data of a space being maintained by the HVAC unit;
receive via the
communication network thermostat data from a thermostat in the space; analyze
at least one
of the supply temperature data, the zone temperature data and thermostat data
to determine if
the HVAC unit is malfunctioning; generate a control signal responsive to the
analysis; and
transmit via the communication network the control signal to an HVAC
controller, wherein
the control signal causes the HVAC controller to transmit a disable signal to
a thermostat
causing the HVAC unit to be disabled by the thermostat.
[0004d] According to yet another aspect of the present invention, there is
provided a
non-transitory computer-readable medium encoded with executable instructions
that, when
executed, cause one or more data processing systems to: receive via a
communication network
supply temperature data indicating an air temperature in a duct coupled to an
HVAC unit;
receive via the communication network zone temperature data of a space being
maintained by
the HVAC unit; receive via the communication network thermostat data from a
thermostat in
the space; analyze at least one of the supply temperature data, the zone
temperature data and
thermostat data to determine if the HVAC unit is malfunctioning; generate a
control signal
responsive to the analysis; and transmit via the communication network the
control signal to
an HVAC controller, wherein the control signal causes the HVAC controller to
transmit a
disable signal to a thermostat causing the HVAC unit to be disabled by the
thermostat.
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[0005] The foregoing has outlined rather broadly the features and technical
advantages
of the present disclosure so that those skilled in the art may better
understand the detailed
description that follows. Additional features and advantages of the disclosure
will be
described hereinafter that form the subject of the claims. Those of ordinary
skill in the art
will appreciate that they may readily use the conception and the specific
embodiment
disclosed as a basis for modifying or designing other structures for carrying
out the same
purposes of the present disclosure. Those skilled in the art will also realize
that such
equivalent constructions do not depart from the spirit and scope of the
disclosure in its
broadest form.
[0006] Before undertaking the DETAILED DESCRIPTION below, it may be
advantageous to set forth definitions of certain words or phrases used
throughout this
patent document: the terms "include" and "comprise," as well as derivatives
thereof,
mean inclusion without limitation; the term "or" is inclusive, meaning and/or;
the phrases
"associated with" and "associated therewith," as well as derivatives thereof,
may mean to
include, be included within, interconnect with, contain, be contained within,
connect to or
with, couple to or with, be communicable with, cooperate with, interleave,
juxtapose, be
proximate to, be bound to or with, have, have a property of, or the like; and
the term
"controller" means any device, system or part thereof that controls at least
one operation,
whether such a device is implemented in hardware, firmware, software, or some
combination of at least two of the same. It should be noted that the
functionality
associated with any particular controller may be centralized or distributed,
whether
locally or remotely. Definitions for certain words and phrases are provided
throughout
this patent document, and those of ordinary skill in the art will understand
that such
definitions apply in many, if not most, instances to prior as well as future
uses of such
defined words and phrases. While some terms may include a wide variety of
embodiments, the appended claims may expressly limit these terms to specific
embodiments.
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BRIEF DESCRIPTION OF THE DRAWINGS
[0007] For a more complete understanding of the present disclosure, and the
advantages thereof, reference is now made to the following descriptions taken
in
conjunction with the accompanying drawings, wherein like numbers designate
like
objects, and in which:
[0008] FIG. 1 illustrates a block diagram of an energy monitoring environment
in
which various embodiments of the present disclosure are implemented;
[0009] FIG. 2 illustrates a block diagram of a data processing system in which
various
embodiments are implemented;
[0010] FIG. 3 illustrates a system for monitoring and controlling an HVAC unit
according to disclosed embodiments; and
[0011] FIG. 4 depicts a flowchart of a process for monitoring and controlling
an HVAC
unit according to disclosed embodiments.
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DETAILED DESCRIPTION
[0012] Industrial and commercial facilities such as factories, retail stores,
office
buildings, and warehouses typically operate multiple HVAC units. If an HVAC
unit
malfunctions, the remaining HVAC units operate under additional stress.
Consider, for
example, a retail store which is operating five HVAC units to cool the store.
If one of
the HVAC units malfunctions, the four remaining HVAC units must run their
compressors for a longer duration to cool the store. If, however, the four
compressors
are forced to run for a time period exceeding a maximum threshold, one or more
additional compressors may also fail, subjecting the remaining operational
units to
further stress. Thus, it is necessary to quickly detect and repair the failed
HVAC unit in
order to prevent a problem from escalating.
[0013] Also, an HVAC unit may malfunction, causing it to operate in a manner
that is
detrimental or contradictory to a desired purpose. Consider, for example, a
warehouse
which is operating five HVAC units to cool the warehouse. If one of the HVAC
units
malfunctions causing it to blow hot air instead of cold air, the remaining
operational units
must operate for a longer duration to compensate for the hot air being blown
by the
malfunctioning unit. In such a scenario, it is necessary to quickly detect the
malfunctioning unit so that it may be disabled and repaired.
[0014] Existing methods and systems generally do not allow remote automatic
monitoring of HVAC units. Existing methods and systems do not provide remote
monitoring of HVAC units so that failed units may be detected and taken
offline for
repair. Typically, a failed HVAC unit is detected due to a change in
temperature at the
facility or by physical inspection. After a failed HVAC unit is detected, the
unit is
manually taken offline for repair.
[0015] FIGS. 1 through 4, discussed below, and the various embodiments used to
describe the principles of the present disclosure in this patent document are
by way of
illustration only and should not be construed in any way to limit the scope of
the
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disclosure. Those skilled in the art will understand that the principles of
the present
disclosure may be implemented in any suitably arranged device or system.
[0016] FIG. 1 illustrates a block diagram of system 100 in which various
embodiments
are implemented. In this illustrative embodiment, system 100 includes data
processing
system 102 connected to storage device 104 and building 106 via network 108.
According to disclosed embodiments, data processing system 102 is located at a
geographically remote location from building 106. Network 108 is a medium used
to
provide communication links between various data processing systems and other
devices
in system 100. Network 108 may include any number of suitable connections,
such as
wired, wireless, or fiber optic links. Network 108 may be implemented as a
number of
different types of networks, such as, for example, the internet, a local area
network
(LAN), or a wide area network (WAN).
[0017] Elements of the present disclosure may be implemented in data
processing
system 102 and storage device 104 in connection with network 108. For example,
data
processing system 102 may obtain supply temperature data via supply
temperature sensor
114 indicating the temperature of the air supplied by one or more HVAC units
112.
HVAC units 112 may be powered by power mains 110. Data processing system 102
is
located at a geographically remote location from the HVAC units. According to
disclosed
embodiments, supply temperature sensor 114 may be positioned in an air duct
(not shown
in FIG. 1) coupled to HVAC units 112. Data processing system 102 may obtain
zone
temperature data via zone temperature sensor 116 indicating the temperature
inside
building 106. Zone temperature sensor 116 may be positioned inside building
106. Data
processing system 102 may obtain outside temperature data indicating the
outside
temperature via outside temperature sensor 120 positioned outside building
106.
According to disclosed embodiments, the supply temperature data, the zone
temperature
data, the outside temperature data, and other relevant data may be
periodically acquired
by the sensors and stored in HVAC controller 124. HVAC controller 124 may have
a
memory (not shown in FIG. 1) for storing the data.
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[0018] According to disclosed embodiments, a processor (not shown in FIG. 1)
in data
processing system 102 may periodically request (or poll) HVAC controller 124
for the
recorded data. In response to the polling from the processor, HVAC controller
124 may
transmit the recorded data to the processor over network 108. According to
other
disclosed embodiments, HVAC controller 124 may periodically transmit the
recorded
data over network 108. For example, HVAC controller 124 may be configured to
transmit the recorded data at every 15-minute interval or may be configured to
transmit
the recorded data when the data value changes. The processor in data
processing system
102 may analyze the data to determine if one or more HVAC units are
malfunctioning,
and in response generate a control signal. Data processing system 102 may
transmit the
control signal to HVAC controller 124 over network 108. According to disclosed
embodiments, the control signal may cause HVAC controller 124 to turn OFF
(i.e.
disable) one or more malfunctioning HVAC units, override scheduled operations,
send
messages to operators of the HVAC units, or take other actions.
[0019] The description of system 100 in FIG. 1 is intended as an example and
not as a
limitation on the various embodiments of the present disclosure. For example,
system 100
may include additional server computers, client devices, and other devices not
shown. In
some embodiments, all or some of the functionality of the data processing
system 102
may be implemented at building 106. In some embodiments, all or some of the
functionality of data processing system 102 may be implemented in one or more
server
computers in a cloud computing environment within network 108.
[0020] FIG. 2 depicts a block diagram of data processing system 200 in which
various
embodiments are implemented. The data processing system 200 includes processor
202
connected to a level two cache/bridge 204, which is connected in turn to local
system bus
206. Local system bus 206 may be, for example, a peripheral component
interconnect
(PCI) architecture bus. Also connected to local system bus 206 in the depicted
example
are main memory 208 and graphics adapter 210. Graphics adapter 210 may be
connected
to display 211.
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[0021] Other peripherals, such as local area network (LAN) / Wide Area Network
/
Wireless (e.g. WiFi) adapter 212, may also be connected to local system bus
206.
Expansion bus interface 214 connects the local system bus 206 to input/output
(I/O) bus
216. I/O bus 216 is connected to keyboard/mouse adapter 218, disk controller
220, and
I/O adapter 222. Disk controller 220 may be connected to storage 226, which
may be any
suitable machine-usable or machine-readable storage medium, including, but not
limited
to nonvolatile, hard-coded type mediums such as read only memories (ROMs), or
erasable, electrically programmable read only memories (EEPROMs), magnetic
tape
storage, and user-recordable type mediums, such as floppy disks, hard disk
drives, and
compact disk read only memories (CD-ROMs) or digital versatile disks (DVDs),
and
other known optical, electrical, or magnetic storage devices.
[0022] Also connected to I/O bus 216 in the example shown is audio adapter
224, to
which speakers (not shown) may be connected for playing sounds. Keyboard/mouse
adapter 218 provides a connection for a pointing device (not shown), such as a
mouse,
trackball, trackpointer, etc. In some embodiments, data processing system 200
may be
implemented as a touch screen device, such as, for example, a tablet computer
or touch
screen panel. In these embodiments, elements of keyboard/mouse adapter 218 may
be
implemented in connection with display 211.
[0023] In various embodiments of the present disclosure, data processing
system 200 is
a computer in system 100, such as data processing system 102. Data processing
system
200 implements HVAC application 228, which may be a software application that
analyzes data transmitted by HVAC controller 124 and in response generates one
or more
control signals for controlling the operation of one or more HVAC units. HVAC
application 228 may include program code for periodically polling HVAC
controller 124
for recorded data and program code for analyzing the data to generate one or
more
control signals. The control signals are transmitted to HVAC controller 124
over network
108.
[0024] Those of ordinary skill in the art will appreciate that the hardware
depicted in
FIG. 2 may vary for particular implementations. For example, other peripheral
devices,
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such as an optical disk drive and the like, also may be used in addition to or
in place of
the hardware depicted. The depicted example is provided for the purpose of
explanation
only and is not meant to imply architectural limitations with respect to the
present
disclosure.
[0025] One of various commercial operating systems, such as a version of
Microsoft
WindowsTM, a product of Microsoft Corporation located in Redmond, Wash., may
be
employed if suitably modified. The operating system is modified or created in
accordance
with the present disclosure as described, for example, to implement
application 228.
[0026] LAN/ WAN/Wireless adapter 212 may be connected to network 235 which may
be any public or private data processing system network or combination of
networks, as
known to those of skill in the art, including the Internet. Data processing
system 200 may
communicate over network 235 to one or more computers, which are also not part
of data
processing system 200, but may be implemented, for example, as a separate data
processing system 200.
[0027] According to disclosed embodiments, a remote data center may be
provided
which monitors a plurality of managed sites, each site operating a plurality
of HVAC
units. The managed sites may, for example, be a retail store, a commercial
building, or an
industrial facility. The remote data center may be linked to the plurality of
managed sites
via a communication network such as the Internet. The remote data center may
include a
data processing system such as data processing system 102 to remotely monitor
and
control the plurality of HVAC units.
[0028] According to disclosed embodiments, a processor in the remote data
center
periodically polls the HVAC units for supply temperature data, zone
temperature data,
thermostat data, outside temperature data, and other relevant information. In
response, the
HVAC units transmit the data to the requesting processor via the communication
network. According to some disclosed embodiments, an HVAC controller transmits
the
data to the processor over the communication network. The processor may
include
program code including algorithm for analyzing the data and for generating one
or more
control signals that are transmitted back to the HVAC controller. The control
signals may
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cause the HVAC controller to override scheduled operation of the HVAC units
and to
disable one or more malfunctioning HVAC units. According to some disclosed
embodiments, in response to the control signal, the HVAC controller may
transmit a
disable signal to a thermostat which causes the thermostat to disable the
malfunctioning
HVAC units.
[0029] According to some disclosed embodiments, only malfunctioning HVAC units
having a detrimental effect on a zone may be disabled. For example, a
malfunctioning
HVAC unit blowing hot air but which is supposed to blow cool air may be
disabled. A
malfunctioning HVAC unit which does not have a detrimental effect on the zone
may not
be disabled. A malfunctioning HVAC unit, for example, blowing outside air when
it is
scheduled to blow cool air may not be disabled if the outside temperature is
cooler than a
thermostat set-point temperature or is below a threshold temperature.
According to
disclosed embodiments, the program code in the processor includes algorithm to
determine which malfunctioning HVAC units may have a detrimental effect on the
zone,
and thus should be disabled. The processor transmits one or more control
signals to the
HVAC units which may cause the HVAC controllers to disable one or more
malfunctioning units. According to some disclosed embodiments, in response to
the
control signals, the HVAC controllers may transmit one or more disable signals
to one or
more thermostats causing the thermostats to disable the malfunctioning HVAC
units.
[0030] Additionally, the data processing system may send messages to site
managers
notifying that one or more malfunctioning HVAC units have been disabled and
may also
indicate the reasons for disabling the malfunctioning HVAC units. According to
disclosed embodiments, a log or a record may be created at the data processing
system
listing the disabled HVAC units and the reasons for disabling the units.
[0031] FIG. 3 illustrates system 300 for monitoring and controlling an HVAC
unit
according to an embodiment. System 300 includes HVAC unit 308 which services
building 304. Although the exemplary embodiment of FIG. 3 shows only a single
HVAC
unit, it will be appreciated that the embodiments may be implemented to
monitor and
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control a plurality of HVAC units distributed across one or more managed sites
such as
retail stores, commercial buildings, or industrial facilities.
[0032] HVAC unit 308 pumps air into building 304 via duct 312 and extracts air
from
building via duct 314. Temperature sensor 316 positioned in duct 312 senses
the
temperature of air supplied to building 304. Thermostat 320 positioned inside
building
304 sets a desired set-point temperature of building 304. Zone temperature
sensor 328
positioned inside building 304 senses the zone temperature. According to some
disclosed
embodiments, thermostat 320 may be equipped with a zone temperature sensor for
sensing the temperature inside building 304, thus eliminating the need for a
separate zone
temperature sensor. Outside temperature sensor 332 may be placed outside
building 304
to sense the outside air temperature.
[0033] According to disclosed embodiments, HVAC controller 324 may be
connected
to HVAC unit 308 and also to the various temperature sensors. HVAC controller
324
may be configured to periodically receive temperature data from sensors 316,
328 and
332 and to store the temperature data locally in a memory (not shown in FIG.
3).
According to disclosed embodiments, HVAC controller 324 may be configured to
control
HVAC unit 308 by overriding scheduled operation and disabling the HVAC unit.
[0034] According to disclosed embodiments, system 300 includes data processing
system 340 connected to HVAC controller 324 via communication network 336.
According to some disclosed embodiments, data processing system 340 is located
at a
geographically remote location from HVAC unit 308. Communication network 336
may
be the Internet or any other type of communication network. Data processing
system 340
includes processor 344, which may include program code for analytic processing
of
various data received from HVAC controller 324. Data processing system 340 may
include poller 352 configured to periodically poll HVAC controller 324. In
response,
HVAC controller 324 periodically transmits recorded data to poller 352 via
network 336.
Data processing system 340 includes database 348 configured to store the
temperature
data. Processor 344 may access database 348 to retrieve and analyze the stored
data.
Processor 344 may include program code for analyzing the stored data to
determine if the
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HVAC unit is malfunctioning and for generating one or more control signals 356
which
may be transmitted to HVAC controller 324 over network 336. As discussed
before,
control signals 356 may cause HVAC controller 324 to disable HVAC unit 308.
According to some disclosed embodiments, in response to control signals 356,
HVAC
controller 324 may transmit a disable signal to thermostat 320 causing
thermostat 320 to
disable HVAC unit 308.
[0035] According to disclosed embodiments, processor 344 may include program
code
configured to analyze a wide range of conditions and to generate one or more
control
signals responsive to the conditions. Consider, for example, a scenario
wherein the
thermostat set-point is 75 degrees, the zone temperature is 75 degrees, but
the supply air
temperature is 85 degrees. Based on analysis of data recorded over a
predetermined time
period, processor 344 may determine that HVAC unit 308 is malfunctioning, but
other
HVAC units in the building may be cooling the space. Accordingly, processor
344 may
generate a control signal to cause HVAC controller 324 to disable HVAC unit
308 for
repair and to send a message notifying that the malfunctioning unit has been
disabled.
[0036] Consider, for example, another scenario wherein the thermostat set-
point is 75
degrees, the outside temperature is 90 degrees, but the supply air temperature
is 90
degrees. Based on analysis of data recorded over a predetermined time period,
processor
344 may determine that HVAC 308 is malfunctioning and is likely blowing
outside air.
Accordingly, HVAC unit 308 may be disabled for repair.
[0037] Consider, for example, another scenario wherein the thermostat set-
point is 66
degrees, outside temperature is 85 degrees, but the supply air temperature is
100 degrees.
Based on analysis of data recorded over a predetermined time period, processor
344 may
determine that HVAC unit 308 is heating building 304 instead of cooling, thus
having a
detrimental effect on the zone temperature. Accordingly, processor 344 may
send a
control signal to HVAC controller 324 to cause HVAC unit 308 to be disabled.
[0038] Consider, for example, another scenario wherein the thermostat
heat/cool set-
point is 64/73 degrees, the zone temperature is 75 degrees, and the supply air
temperature
is 85 degrees. Analysis of data over a predetermined period of time may
indicate that the
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HVAC unit 308 is not working well, but the fan is blowing most of the time.
Accordingly, the HVAC unit 308 may be disabled for repair by processor 344.
[0039] Consider, for example, another scenario wherein HVAC unit 308 has a
heating
setpoint of 67 and a cooling setpoint of 76. The outside air temperature is 25
degrees, so
the HVAC unit should be heating the space in building 304. The zone
temperature is 55
degrees and the supply air temperature is 30 degrees. Analysis of data over a
predetermined period of time may indicate that HVAC unit 308 is likely blowing
cold
outside air into building 304. Accordingly, the HVAC unit 308 may be disabled
until it
can be repaired.
[0040] According to some disclosed embodiments, a processor may include
program
code for executing the following processes:
[0041] (1) An HVAC unit will be turned OFF if the thermostat is set for
cooling, but
the supply air temperature is greater than the zone temperature by a
predetermined
amount.
[0042] (2) An HVAC unit will be turned OFF if the thermostat is set for
heating, but
the supply air temperature is less than the zone temperature by a
predetermined amount.
[0043] (3) The zone temperature may be considered a factor in determining if
the
HVAC unit should be turned OFF, but not the exclusive factor. For example, the
HVAC
unit may be turned OFF even if the zone temperature is within specification if
the
processor determines that other HVACs at the site may be compensating for the
malfunctioning HVAC unit.
[0044] (4) The processor may consider indoor and outdoor humidity data, if
available.
If the HVAC unit is performing poorly but is still dehumidifying the space,
HVAC 308
may not be turned OFF.
[0045] (5) The processor may prevent all HVAC units from being turned OFF
since
they may provide air circulation.
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[0046] (6) The HVAC unit may not be turned OFF if the site indicates
accordingly. For
example, the site may indicate that the HVAC unit supplies air to a computer
room or a
data center, and thus the HVAC unit may be considered too important for
automatic
control and therefore may not be turned OFF.
[0047] (7) The HVAC unit will not be turned OFF if CO2 level in the space is
greater
than a maximum allowable level.
[0048] FIG. 4 depicts a flowchart of a process for monitoring and controlling
an HVAC
unit in accordance with disclosed embodiments. This process may be performed,
for
example, in one or more data processing systems, such as, for example, data
processing
system 200, configured to perform acts described below, referred to in the
singular as
"the system." The process may be implemented by executable instructions stored
in a
non-transitory computer-readable medium that cause one or more data processing
systems to perform such a process. For example, HVAC application 228 may
comprise
the executable instructions to cause one or more data processing systems to
perform such
a process.
[0049] The process begins in block 404 with the system receiving supply
temperature
data indicating a supply air temperature in a duct coupled to the HVAC unit.
The system
may receive the supply temperature data from an HVAC controller in response to
polling
by a poller associated with the system. The supply temperature data may be
transmitted
over a communication network such as the Internet.
[0050] In block 408, the system receives zone temperature data of a space
being served
by the HVAC unit. The zone temperature data may, for example, indicate the
temperature
of a space inside a building. The zone temperature data may be sensed by a
sensor
positioned inside the building.
[0051] In block 412, the system receives thermostat data from a thermostat in
the
space. The thermostat may, for example, be set to maintain the space at a
desired
temperature.
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[0052] In block 416, the system analyzes the received data. The system may,
for
example, execute instructions in HVAC application 228 to analyze the received
data.
[0053] In block 420, the system generates one or more control signals
responsive the
analysis. In block 424, the system transmits the control signals to an HVAC
controller.
The control signal may, for example, cause the HVAC controller to disable the
HVAC
unit. According to some disclosed embodiments, in response to the control
signal the
HVAC controller may transmit a disable signal to a thermostat causing the
thermostat to
disable the HVAC unit.
[0054] Those skilled in the art will recognize that, for simplicity and
clarity, the full
structure and operation of all data processing systems suitable for use with
the present
disclosure is not being depicted or described herein. Instead, only so much of
a data
processing system as is unique to the present disclosure or necessary for an
understanding
of the present disclosure is depicted and described. The remainder of the
construction
and operation of the data processing system may conform to any of the various
current
implementations and practices known in the art.
[0055] It is important to note that while the disclosure includes a
description in the
context of a fully functional system, those skilled in the art will appreciate
that at least
portions of the mechanism of the present disclosure are capable of being
distributed in the
form of instructions contained within a machine-usable, computer-usable, or
computer-
readable medium in any of a variety of forms, and that the present disclosure
applies
equally regardless of the particular type of instruction or signal bearing
medium or
storage medium utilized to actually carry out the distribution. Examples of
machine
usable/readable or computer usable/readable mediums include: nonvolatile, hard-
coded
type mediums such as read only memories (ROMs) or erasable, electrically
programmable read only memories (EEPROMs), and user-recordable type mediums
such
as floppy disks, hard disk drives and compact disk read only memories (CD-
ROMs) or
digital versatile disks (DVDs).
[0056] Although an exemplary embodiment of the present disclosure has been
described in detail, those skilled in the art will understand that various
changes,
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substitutions, variations, and improvements disclosed herein may be made
without
departing from the spirit and scope of the disclosure in its broadest form.
[00571 None of the description in the present application should be read as
implying
that any particular element, step, or function is an essential element which
must be
included in the claim scope: the scope of patented subject matter is defined
only by the
allowed claims.
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